Troubleshooting; General Information For Service - LG LMHM2237BD Service Manual

6. TROUBLESHOOTING

6-1. General Information for Service

GENERAL PRECAUTIONS IN USE
A. Never operate the unit when it is empty.
Operating the oven with no load may shorten the
life of the magnetron. Whenever cooking dry
foods (dried fish, bread, etc.)or a small amount of
food, be sure to put a glass of water into the
cooking compartment. The glass turntable may
become hot after operating, be careful when
touching it.
B. Aluminum foil should be avoided because it will
disrupt cooking and may cause arcing. However,
small pieces may be used to cover some parts of
food to slow the cooking. Any aluminum foil used
should never be closer than 1 in. (2.5 cm) to any
side wall of the oven.
TRIAL OPERATION
After installation, the following sequences and
results should be checked carefully.
A. Put a container filled with water (about 1 liter) into
the oven, and close the door tightly.
B. Set cooking time for 10 minutes by touching 1 and
then 0 three times. 1, 0, 0, 0 appears in the
display window.
C. Press the START button
Make sure the cavity light comes on. The unit will
begin cooking and the display window will show
the time counting down by seconds.
D. After about 5 minutes, make sure the primary
interlock switch, the secondary interlock switch
and the interlock monitor switch operate properly
by opening and closing the door several times.
Press the START button each time the door is
closed.
E. Continue operating the unit. Two short beeps and
one long beep will sound when the time is up.
The unit will shut off automatically.
F. Confirm the water is hot.
G. Finally, measure the output power according to
the POWER OUTPUT MEASUREMENT on
page 8.
FEATURES AND SPECIFICATIONS
FEATURES
A. The safety systems incorporated in this model
are:
(1) Primary interlock switch
(2) Secondary interlock switch
(3) Interlock monitor switch
(4) Choke system
(5) Oven cavity thermostat
(Note This thermostat located on the oven
cavity will open and stop the unit from
operation only if a high temperature is
reached, such as, a fire created by
overcooking food.)
B. Any one of 10 power output levels ranging 0 W to
1,000 W can be selected by the touch control and
electronic computer system.
C. Cooking time can be displayed on the digital
readout.
D. Three different cooking stages (including defrost)
can proceed from one cooking stage to another.
This is made possible with the memory function of
the microprocessor.
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